Dear all
I have an old Fluke 8840a which is working fine, except the display is going dark from time to time. Not completely off, just fading out... few seconds later coming back on. Until now it helped to gently push on top of the case to make the display come back on.
Today, it didn't work at all. I opened the unit and measured voltage rails (all fine). While I had the unit open, it was upside down. I switched it on and noticed that the display was working again. I put it back together and switched it on (in its normal position) and it had the display issue again. It seems to be very reproducible that the display works reliably only if the unit is turned upside down.
I guess this is a mechanical issue, but no idea where exactly.
Any idea?